Time：2019-07-04| Author：Admin
Jiangmen Junsheng Industrial Die Casting Production often encounters new product development and the renewal of old molds. In general, the internal and external qualities of die castings depend on die casting process parameters such as molten metal temperature, die casting pressure, speed and speed switching points. However, in most cases, it is also closely related to mold design and production. Factors affecting the mold, including the number of cavities, the design of the gating system, the type of gate (position and size), and the structure of the casting itself. In order to avoid casting defects caused by mold design, and to test and correct some problems in mold making, it is necessary to test the finished mold.
1 Test mode and process parameter optimization of die-casting die
The main purpose of the test mode is to find optimized process parameters and mold modification schemes. It is required to ensure that the mold can stably and uninterruptedly mass produce qualified products even if the materials, machine settings or environmental factors have changed. Limit the "adaptation" of the mold, not just to get a few good test samples.
1.1 Find out the problem with the mold
The molds produced by the mold factory are all expected to be a mold with good adaptability (ie, molding parameters or wide process conditions). However, due to poor design considerations or incomplete processing during the production process, problems often arise, such as excessive size, poor local transition, and improper structure, resulting in unqualified castings or trial production of the mold. Unable to proceed. The test mode is the simplest, direct and effective way to find the mold problem.
1.2 Find the best forming conditions
During the trial process, the test mode personnel can find a set of the most suitable process data, and the set of data can be used as the default value for setting the machine parameters during mass production, and the most mass production of the mold is adjusted according to the set of data. Good process conditions.
2 Preparation before the test
2.1 Determine reasonable trial steps
2.2 Strict inspection of the mold
2.3 Check the pressure chamber and sprue bushing and the gap between them and the punch
2.4 Fixing the mold
3 Test process parameters and adjustments affecting the quality of castings
3.1 Process parameter setting principle
3.2 Basic requirements for test mode
3.3 7 sets of main process parameters
3.4 Inspection of the first castings
4 On-site inspection of the test sample
5 Analysis and Solution Examples of Test Die Defects
5.1 Improvement of poor molding
5.2 Treatment of partial shrinkage
6 Conclusion
The test mode is an actual inspection process for the use of the mold. After the test, the sample and inspection record and process parameter record (including various pressures, casting temperature and mold temperature, time, etc.) should be properly preserved during the test mode; these records It is the basis for analyzing and modifying molds and formulating mass production processes in the future. At the same time, it has accumulated practical experience for mold design of similar castings in the future, especially for the future CAE filling simulation analysis.
Solving various problems in the test mode is a patient and meticulous work. It is necessary to have a detailed understanding of the casting structure, die-casting process and mold structure. It is imperative to modify the mold blindly to avoid unnecessary losses.
Finally, it is important to emphasize that the purpose and focus of the test is to optimize the mold and process to meet the requirements of mass production, not just to test several casting samples.
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